Alien 3

EE26-37D4 Slower fuel consumption for flame thrower
7D26-37D4 Faster fuel consumption for flame thrower
FD36-44D1 Start with more rifle clips
4D36-44D1 Start with even more rifle clips
D036-44D1 Start with fewer rifle clips
FD3B-4F01 Start with more grenade clips
4D3B-4F01 Start with even more grenade clips
D03B-4F01 Start with fewer grenade clips
3C28-44D4 Infinite ammo for pulse rifle
3C22-3D64 Infinite ammo for grenade launcher
3C25-3704 Infinite oil for flame thrower
D464-1D60 Take less damage
DD6D-1700 Maximum energy from medi-kits
D76D-1DA0 Less energy from medi-kits
EE6B-CD00 Longer invulnerability after being hit
DD64-1D60 Most attacks do no damage--can switch on and off
The next three codes work on extra clips only, not the ones you start with.
742A-44A4 Less ammo in rifle clips
CD2A-44A4 More ammo in rifle clips
D923-3D64 Less ammo in grenade clips
F023-3D64 More ammo in grenade clips